Detachable stub needle for hypodermic syringes



July 29, 1958 DETACHABLE STUB NEEDLE FOR HYPODERMIC SYRINGES Filed March26, 1953 INVENTOR Y DQNIEL. GABRIEL I ATTORNEY D. GABRIEL 2,845,068 IDETACHABLE- STUB NEEDLE FOR HYPODERMIC SYRINGES Daniel Gabriel, BonnyBlue, Va.

Application March 26, 1953, Serial No. 344,789

6' Claims. (Cl. 12s--'-221) This inventionv relates to hypodermicsyringes for use in injecting various potions into a patient. Moreparticularly, the invention deals with the provision of a syringe havinga stub needle structure forming a part thereof which can be utilized forinitial filling of the syringe, after which, the hypodermic needle canbe coupled with the syringe for injection into a patient in the usualmanner.

Still more particularly, the invention deals with a structure ofthe'kind defined, wherein a stub needle-is employed having a taperedportion facilitating detachable mounting of the needle with the syringeto facilitate removal of the needle from time to time.

The novel features of the invention will be best understood from thefollowing description, when taken together with the accompanyingdrawing, in which certain embodiments of the invention are disclosedand, in which, the separate parts are designated by suitable referencecharacters in each ofthe views and, in which:

Fig. 1 is a side view of a syringe, diagrammatically indicating themethod of its use.

Fig. 2 is an enlarged sectional view on the line 22 of Fig. 1 throughone end portion of the syringe and indicating a hypodermic needle unitmounted thereon, only part of the needle unit being shown; and

Fig. 3 is a view, similar to Fig. 2, showing only a part of theconstruction and showing a modification.

In Figs. 1 and 2 of the drawing, I have shown at a syringe having areduced tubular end portion 11, with which a ferrule 12 is mounted, theferrule enveloping the portion 11 and having a downwardly extendingexternally tapered tubular part 13, the bore 14 of which is in alinementwith the bore 15 of the extension 11.

Considering Fig. 2 of the drawing, it will be noted that a hypodermicneedle unit 16 has, at its upper end, a tapered bore 17 to fit snugly onthe tapered extension 13 for detachable mounting of the unit 16 with thesyringe. Below the tapered bore 17 is a straight bore 18 which forms achamber 19 in which a stub needle 20 is adapted to be arranged in themanner clearly illustrated. The unit 16 has a large diameter bodyportion 21 which is preferably of rectangular or other form tofacilitate coupling and uncoupling of the unit with the tapered portion13. The body 21 has a reduced end 22, in the small diameter bore 23, ofwhich is secured the hypodermic needle shown in part at 24 in Fig. 2 ofthe drawing.

The stub needle 20, in the construction shown in Figs. 1 and 2 of thedrawing, comprises a tubular body, the lower end of which is abruptlycutaway, as seen at 25, to form a sharply pointed end 26, which isadapted to pierce the rubber stopper 27 of a vial 28, diagrammaticallyshown in Fig. 1 of the drawing in the operation of withdrawal of fluidinto the syringe, preparatory to injection into the body of the patient.

My invention deals primarily with the handling of heavy fluids, whereina problem exists in uses with conventional types of syringes. Thepresent practice requires. the use of a special needle for coupling withthe r 2 syringe to draw the fluid into the syringe, which needle istlienremoved and the hypodermic needle attached.

With my improved construction, I provide the syringe with a stub needlestructure which constitutes a direct part of the syringe, thus the stubneedle can be inserted into the vial, the fluid drawn into the syringeand then in a single operation, the hypodermic needle unit attached tothe syringe for discharge of the fluid.

The needle 20 has, substantially centrally thereof, an

outwardly extending collar portion 29, which seats upon the outer end ofthe portion 13, as clearly noted. The outer surface of the collar 29 canbe roughened or so shaped as to facilitate attachment and detachment ofthe needle with the syringe or the ferrule l2 thereon. This attachmentand detachment is performed solely when the needle point 26 becomes dullor the needle becomes damaged in any way tointerfere with proper usethereof. The collar 29 is so positioned'on the needle20 as to form,between the upper end of the cutaway or bevelled portion 25 and thecollar, a short space 30 which is of sufiicient length to extend throughthe rubber stopper 27 to effect an air tight seal of the needle in saidstopper. The collar 29 forms a stop, checking movement of the needleinto the rubber stopper disc 27.

Beyond the collar 29, the needle has a slightly'tapered portion 31 whichis so made as to fit snugly, but firmly, in the bore 14 of the ferrule12 or the tapered portion 13 thereof. This attachment is such as toprevent accidental displacement of the stub needle .20 when the needleis withdrawn from the stopper 27, but as and when required, forcibleremoval of the needle can be performed for replacement, as above stated.

In-the showing of Fig. 2 of the drawing, the upper portion of the needle20 is shown with clearance in the bore 14 simply to illustrate the taper31 but, in reality, the needle will fit snugly, but freely, in the bore14.

In the assemblage of the parts as shown in Fig. 2 of the drawing, itwill appear that the needle 20 fits freely within the chamber formed bythe bore 18 of the hypodermic unit 16, when said unit is attached to thesyringe.

In Fig. 3 of the drawing, I have shown a slight modification of thestructure shown in Figs. 1 and 2, wherein a needle 32 is employed whichdiffers from the needle 20 primarily in dispensing with the taper 31and, in place thereof, the collar portion 33 includes an annularupwardly extending and slightly conical sleeve 34 adapted to fit snuglyupon a reduced tapered portion 35 of the equivalent of the taperedportion 13, which is designated by the reference character 13 in Fig. 3.In other words, with thestructure shown in Fig. 3 of the drawing, theneedle 32 can fit snugly in the bore 14 and frictional engagement forsecure mounting of the needle 32 can be established between the taperedsleeve 34 and the tapered surface 35.

The structure of the needle shown in Fig. 3 of the drawing is applicablefor use in syringes wherein the body portion of the syringe includes theintegral tapered portion .13 and the ferrule 12 is not employed The onlymodification required in structures of this type and kind is inmodifying the tapered end 13' to the extent of providing the reducedtapered portion 35 and this latter tapered portion can have a firmerengagement than the engagement of the hypodermic needle with the taperedportion 13. The surface of the collar 33, including the sleeve 34, canbe constructed to provide a firm grip or other means to facilitateattachment and detachment of the needle 32, particularly in removal ofsaid needle.

With the construction shown in Fig. 3, it will be noted that the sleeve34,as well as the collar 33, are set inwardly a sufficient degree toclear the bevelled surface of the portion 13' and, thus, not interferein any way with the coupling and uncoupling of the hypodermic needletherewith.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. A stub needle structure for hypodermic syringes of the characterdescribed, the syringe having, at one end portion thereof, means forminga tubular externally tapered portion, a hypodermic needle unitdetachably mounted with said tapered portion, said unit including a bodyhaving a large diameter bore therein, one end of the bore being taperedto fit the tapered tubular end of said syringe, a stub tubular needlemounted in said tubular tapered end of the syringe and having a largediameter collar fitting on the end of said tapered tubular portion, theouter end of the needle being abruptly tapered to form a pointed end,and said needle, adjacent the large diameter collar, having a taperedportion engaging said first named means in retaining the needle againstaccidental displacement therefrom.

2. A structure as defined in claim 1, wherein the tapered portion ofsaid needle fits snugly in the bore of said tubular tapered portion.

3. A structure as defined in claim 1, wherein the tapered portion ofsaid needle comprises a sleeve frictionally engaging a reduced taperedportion on said first named means.

4. A structure as defined in claim 1, wherein said first named meanscomprises a ferrule secured to a reduced end of said syringe, and thetapered portion of said needle fits in the bore defined by the tubulartapered portion of said ferrule.

5. A stub needle structure for mounting on hypodermic syringes, saidneedle comprising a tubular body having an enlarged integral collarcentrally thereof, one end portion of the needle being abruptly cutawayto form a pointed end, the cutaway portion of the needle terminatingshort of and in close proximity to one surface of said collar, that partof the needle between the cutaway portion and collar forming a short airseal portion on the needle adjacent said surface of the collar ininsertion of the needle through the rubber stopper of a vial, the otherend portion of the needle having a tapered part adjacent the collarportion and spaced from said second end, and said tapered part providingfrictional engagement of the needle with a hypodermic syringe.

6. A structure as defined in claim 5, wherein the tapered part comprisesa sleeve integral with the collar and disposed in spaced relation to thetubular body of said needle.

References Cited in the file of this patent UNITED STATES PATENTS1,180,051 Laurent Apr. 18, 1916 2,591,129 Brouwer Apr. 1, 1952 FOREIGNPATENTS 693,500 France Aug. 25, 1930 714,917 France Sept. 14, 1931739,312 France Oct. 25, 1932 998,648 France Sept. 26, 1951

